Semi-automatic telephone system.



A. E. LUNDELL. SEMI-AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED NOV. 6. 1915.

'mwmmo- Patented Jul 17, 1917.

- 1 3 SHEETSSHEET ii maa amw A. E. LUNDELL. SEMI-AUTOMAHC TELEPHONE SYSTEM. APPLICATION FILED NOV. 6, 1915- Patented. July 17, 1917.

a SHEETSSHEET 2.

A. E. LUNDELL.

SEMI- AUTOMAHC TELEPHONE SYSTEM. APPLICATION FILED movie. 1915.

Patenmd July 17, 1917.

3 SHEETS-SHEET 3- In en for; Alfie/0 E. Lundell,

ASSIGNOR, BY MESNE ASSIGNMENTS, TO

RATED, A CORPORATION OF NEW YORK.

SEMI-AUTOMATIC TELEPHONE SYSTEM.

messes.

Specification of Letters Patent.

Patented July 17, 1917.

Application filed November 6, 1915. Serial No. 60,002.

To all whom it may concern:

Be it known that I, ALBEN E. LUNDELL, a citizen of the United States, residing at New York, in the 1 county of Bronx and State of New York, have invented certain new and useful Improvements in Se1ni-Automatic Telephone Systems, of which the following is a full, clear, concise, and exact description. 7

This invention relates to telephone systems, and particularly to telephone systems of the semi-automatic type. It is desirable in semi-automatic telephone systems to have the operators sending apparatus so arranged that if the operator has assigned a particular link circuit or cordless trunk to a calling subscriber, she may be able to recall such assignment at will and assign a different trunk either'to the same or some other calling subscriber.

' The object of the invention, therefore, is to provide an operators'sending apparatus in which the assignment of a link circuit or cordless trunk frees the sender on a previously assigned trunk in case such trunk is not freed by the normal operation of the keys.

I In the drawings, Figures 1, 2 and 3, ar,

ranged Fig. 2 to the-right of Fig. 1 and Fig. 3 below Fig. 2, illustrate the invention as applied to a telephone system, only so much. of the telephone system being shown as is necessary for an understanding of the invention. For a detailed description of a telephone system to which this invention is applicable, reference may be had to Patent 5 No. 1,125,579 of January 19, 1915 granted to F. R. McBerty.

A description of the operation of assigning a link circuit or trunk, the recalling of such assignment and the substitution therefor 'ofanother trunk, will be described in detail, as it is thought by this method the invention will be most clearlyunderstood.

A subscriber, the number of whose station is100, wishing to speak with any other subscriber of the system, as subscriber whose station is numbered 7 180, removes his receiver from the switchhook, lighting in the usual manner the signal lamp at the central ofiice. The A operator located at 102, observing the lamp lighted, inserts a plug into the jack individual to the calling subscriber and depresses thelistening key 103, placing herself in communication with the calling subscriber. The calling subscriber informs the A operator of the number of the. subscriber with whom he wishes to speak, whereupon the A operator depresses the key 104, connecting herself with the B operator at position 105. She repeats to the B operator the information she has already received from the calling subscriber, whereupon the B operator informs the A operator of the number of the trunk she proposes to assign to the calling subscriber, as trunk 47. Simultaneously therewith she depresses the key associated with said trunk and to which the numeral 201 has been given. The A operator then inserts the plug 106 into the jack 107, thus connecting the line of the calling subscriber to the trunk 47. After assigning the trunk the B operator sets up on her keyboard the number of the wanted subscriber, and it is assumed that such number is 7180. The depression of the key 201 closes a circuit from battery, motor magnet of sequence switch 202, conductor 203, lower left contact of sequence switch spring 204, conductor 205, the depressed key 201 to ground, moving sequence switch 202 from position 1 into position 2. In position 2 of this sequence switch a circuit is closed from battery, motor magnet of sequence switch 300, conductor 301, upper left contact of se quence switch spring 302, conductor 303, lower right contact of sequence switch spring 206, conductor 207, right armature and back contact of disconnect relay 208 to ground, moving sequence switch 300 from position 1 into position 2.

On sequence switch 300 coming into posi tion 2, circuit is closed from battery, relay 304, conductor 305, upper left contact of. sequence switch spring 306, conductor 307, brush 308, contact 309, conductor 310, lower right contact of sequence switch spring 209, conductor 207, right armature and back contact of disconnect relay 208 to ground. Relay 304 energizes, attracting its armature and completing a circuit from battery, motor magnet of sequence switch 300, conductor 301, lower left contact of sequence switch. spring 302, conductor 312, right armature.

and front contact of relay 304 to ground,

moving the sequence switch 300 from posi-,

tion 2 into position 3, in which position the operator having depressed the keys corre- 328, conductor 329, upper right contact of sequence switch sp'riii leasing the'dep'ressed 'keys.

a pos'iuo'wror sequence switch 300 a circuitis closed from battery, line relay 210, upper righrco rau of sequence switch spring 2l;l',conductor 212, cemacts'is, brush l lf c'on'ductor 315, upper right contact of sequence avian spring 316; relay 317, conductor "3 18, brii'sh 319, terminal 320, conductor321, lower right contact ot'sequence switch springer) 'toflgrounu', energizing the line relay21 0w hich,' at'its armatureand r enrctaqact, closesan energizing circuit forum motor magnetof sequence switch 202, movin the same fro'm position 2 into armesan-om which point the call pro} gresses" in the usual manner particularly described in the above refi ok... y r

It may be, however, that the B operator becomes confused as, forjexairiple, when sever'a1"*'A operators connect at the same time with her tall apparatus, the directions sh recew'es under these conditions are not net after; so that after ass gn n a particular trunk'to afc' alling subscriber she wishes toreeall such assignment, I'Lther'etore, she has assigned a trunk and 1s m doubtasto whether or not is the ro r l e be a si n d h ma ke e ie from a'subs'equent A operator, paying no attentionto'what has been done before. She then assigns the last calling subscriber adifl'eient, trunk,as trunlc53," the assign.- ment, er winc es cohtrolled by the key 215'.

'It is assumed in this case" that the complete number on the first assignment has not'bee'n setiipby the operatojrfand that apparatus shown in is in position g while the apparatus shown in Fig 2 is in position 2.

cuit, from battery, disconnect relay 208', condr1etor,"216', upper right contact of sequence switch 217, key 201, conductor 218,; key 215 a ground, energizing the disconnect relay 208, whichllocks up a't its left armature front contact, upper left contactio f js equence switch spring 219, which remains closed? until sequence switch 202 e out oif ;positionj11. The energiz ation of'the disconnect relay 208 closes a circuit for the motonrnagiiet of sequence switch 202 from battery, motor magnet, conductor 208, upper left contact of sequence switch spring 2.04;, conductor 240, right armature and front contact of disconnect relay 208 to ground, moving the sequence switch 202 from position 2 and into position 6. 'The disconnect relay 208 being energized by the depression the trunk key 215, the energizing circuit for the relay 3041 is broken at the right armature and back contact of the disconnect relay, whereupon the armatures of relay 304'retract, closing a circuit from battery, motor magnet of sequence switch 300, conductor 30l,"upperright contact of sequence switch spring conductor 323?, right armature and b'ackcontact of relay 304: to ground, moving sequence switch 300 from position 3, through position 16 and into the position 17, in which position a circuit'will be closedffrom battery, return magnet 326, lower right contact of sequence switch spring 327, to ground. The energi'iation of this magnet" moves the brushes 308 314, 319 to their initial position, at which point the normal contact 325 is closed, completing a circuitfgrom battery, motor magnet of sequence switch 300, lower right contact of sequence switch spring 302-, cenductor 324, normal contact 325 to ground, moving sequence switch 300 from position 17 into position 1. i

In passing through position 4, a circuit will be closed from battery, release magnet 328, conductor 329, upper right contact of sequences'witch spring 327 to ground, energiiing the release magnet and allowing any depressedkey or keys'to return tonormah In the meant-ime,a circuit is -closed from battery, motor magnet 220,- conductor 221', armature and back contact of relay 222, upper right contact of sequence switch spring 206, conductors 207 and- 228, upper right contact of sequence switch spring 213; to ground, energizing said drive magnet and moving 1 the brush carriage until= the' arm 22% contacts with the segment 225", at which point in the operation the following circuit is closed: battery, resistance 220, low-er left contact of s'equei celswitch spring-227', eon; ductor 228', segment 225-,arm '2251, conduct-rm 229, lower left contact of sequence switch spring 230, relay 222; upper right contuctoi sequence switch'spring 209, conductors 20.? and 22 3, upper right-- contact of sequence switch spring 213 to, ground; energizing relay 222,- breaking the circuit for dr-i-v-e magnet 220, stepping the brushcarriage, 12 0 and" completing a circuit from battery, motor magnet ofsequence switch-202, conductor 203, armature andfront contact of-relay 222, upper right contact of sequence switch springi206, conductors 209-and' 223'; upper right contact of sequence; switch spring 213 to ground, moving sequence switch 202 out of position- 0 and into .posi 1 tion 7, in which position v a circuit will; be closed from battery, motor magnet of se- 1313:

' contact of sequence switch spring 204:, conductor 240, right armature and front contact of'disconnect relay 208, to ground, moving sequence switch 202 from position 7, through position 8 and into position 9..

In position 9, the circuit above traced for relay 222 is again closed, Completing a circuit from battery, motor magnet of sequence switch 202, conductor 208, armature and front contact of relay 222, upper 'right'contact of sequence switch spring 206, conductors 207 and 223, upper right contact of sequence switch spring 213 to ground, moving the sequence switch into position 10, in which position the energizing circuit for relay 222 is broken at the lower left contact of sequence switch spring 227, and the energizing circuit for motor magnet of sequence switch 202 is established at the upper left contact of sequence switch spring 204 to move sequence switch 202 through position 11 and into position 16.

In position 16, a circuit is again closed, in the manner above described, for the driving magnet 220 to move the brush carriage into its normal position, where a circuit is closed from battery, resistance 226, upper left contact of sequence switch spring 227, arm 224, conductor 229, lower left contact of sequence switch spring 230, relay 222, upper right contact of sequence switch spring 209, conductor 207, right armature and back contact of relay 208 to ground, energizing the relay' 222, which, at its armature and front contact, again closes a circuit to move sequence switch 202 from position 16 to posi tion 18.

In position 18 a circuit is closed from battery, motor magnet of sequence'switch 202, conductor 203, lower right contact of sequence switch spring 214, armature and back contact of line relay 210 to ground, moving sequence switch 202 from position 18 into position 1, where it is entirely dis connected from the previously assigned trunk and is now under control of the last assigned trunk, and where the operation takes place in the manner heretofore described. 7

To provide for taking care of a call to which a trunk has been assigned and then recalled, the operator may transfer such call over to a superviser, who will take care of the same in the usual manner, but since this forms no part of the present invention it will not be described in detail.

What is claimed is:

1. In a telephone exchange system, an operators sending apparatus, a plurality of trunks, means associated with each trunk for connecting the same to said sending apparatus to extend a call, and means associated with said sending apparatus for freeing the same from a connected trunk when Operated operation prior to the sending operation, said means being operated in response to the operation of the connecting means associated with another trunk. p

i 2. .In a telephone exchange system, a plurality of trunks, a sending apparatus common to said trunks, means associated with each trunk adapted, when operated, to cause connection of said sending apparatus with the corresponding trunk, means for causing of said sending apparatus, and means responsive to the operation of the said means associated with each of said trunks of another of said trunks prior to the operation of said sending apparatus to cause disconnection of said sending apparatus from a trunk.

3. In a telephone exchange system, a plurality of trunks, a sending apparatus common to said trunks, means associated with each trunk adapted, when operated, to cause connection of said sending apparatus with the corresponding trunk, means for causing operation of said sending apparatus, and means responsive to the operation of the said means associated with each of said trunks of another of said trunks prior to the operation of said sending apparatus to cause disconnection of said sending apparatus from connection with a connected trunk and to cause connection of said sending apparatus with said other trunk.

1. In a telephone exchange system, a central ofiice, a plurality of subscribers lines terminating thereat, a plurality of A operators positions at said central oflice adapted to be connected to any of the subscribers lines, a B operators position at said central oflice accessible to any of the A operators, a plurality of trunks extending between said A and B operators positions and having a sending apparatus common thereto, means operable by a B operator individual to each trunk for common sending apparatus with such trunk, and means associated with the said sending apparatus actuated by the associating means individual to another trunk before the first sending operation is completed for disassociating the first said trunk and the sending apparatus, and associating another trunk therewith.

5. In a telephone exchange system, a central office, a plurality of subscribers lines terminating thereat, a plurality of A operators positions at said central office adapted to be connected to any of the subscribers lines, a B operators' position at said central office accessible at any of the A operators positions, a plurality of trunks extending between the A and B operators positions and having a sending apparatus common thereto, means operable by the B operator for initiating the sending operation, means connected to any trunk and unassociating the i ing subs'cri-b'ers line, "and means associated with saidsending apparatus and actuated by the 'ineains "connected to zv'nother trunk, and prior *to the initiation of the -sehding operation, for disassociatin'g the first said trunk from the sending apparatus and 1550- 10 ciating the second said thunk therewith.

In witness whei eof, I hereunto subscribe m naine this fi fith day of November, A. 1915.

ALBEN LUNDELL.

jGopie's of this patent may 'be obtained-for five cents ach, byaddressing the Commissioner ;of Patents.

. o "Washington, ID. G. 

